After you have collected all of the Tower Heart shards, take it to Queen Fay so 
she can repair it. After the cutscene, take the Tower Heart to the sanctuary 
dungeon to power it up with the shrines. After you have charged the Tower Heart 
at the first shrine, you, your minions, and the Tower Heart will fall. When you 
find the Tower Heart, it will be sitting on top of a gnome hole that spawns an 
infinite amount of gnomes. Position all your minions next to the hole by using 
the guard marker. When you have your minions where you want them, remove five 
minions so that you can move the Tower Heart to a safe location. When you think 
the Tower Heart is out of you way, put all your minions on top of the gnome 
hole. The gnomes will die as they jump out of the hole. Walk back to the 
Netherworld Gate, but do not go into the gate. This will require about twenty 
minutes. Note: Do not get too close to the gnome hole, because the gnomes will 
run past your minions and attach themselves to you.